The calculated distance (air line) between Reggio nell'Emilia and San Martino in Rio is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to San Martino in Rio is certainly longer, as only the direct route (as the crow flies) between Reggio nell'Emilia and San Martino in Rio has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles